fixing actions

Author: arsho

.github/workflows/black.yml

@@ -32,12 +32,13 @@ jobs:
       run: |
         git config --local user.email "${{ github.actor }}@users.noreply.github.com"
         git config --local user.name "${{ github.actor }}"
-        git diff-index --quiet HEAD || git stash -u
-        black $(git ls-files '*.py')
-        git stash drop
-        git add .
-        message="$(git log -1 --pretty=%B) Format Python code with Black"
-        git diff-index --quiet HEAD || git commit -m "$message"
+        if [ "$(git ls-files --modified '*.py' | wc -l)" -ne 0 ]; then
+          git stash -u
+          git stash drop
+          git add .
+          message="$(git log -1 --pretty=%B) Format Python code with Black"
+          git commit -m "$message"
+        fi
     - name: Push changes
       run: |
         git push origin master